While there are hundreds of studies showing the benefits of nutritional supplementation, they should be taken in moderation and at recommended dosages. National Center Institute researchers recently reported that men who consume too many vitamins could increase their risk of prostate cancer. According to findings, men consuming more than the recommended dosage of multi-vitamins increased their risk of advanced prostate cancer by 30 percent. The findings are significant as the number of men who participated in this 5-year study was close to 300,000. Researchers found the strongest link with those men having a family history of prostate cancer as well as those consuming selenium, beta-carotene and/or zinc supplements. They concluded that men should follow the recommended dosage on their vitamin bottles and not attempt to over supplement.